Question

Write the circulatory system in hydra, snail,sponges,earthworm

Answer 1

$circulatory \: system \: in \: hydra$
Has gastrovascular cavity
$circulatory \: system \: in \: snail$
Open circulatory system
$circulatory \: system \: in \: sponges$
Do not have circulatory system .
$circulatory \: system \: in \: earthworm$
Closed circulatory system

Answer 2

no,,they do not possess circulatory system.The water in which they live brings food and oxygen